class_docstr: Base class of HalfCheetah meta-environments.
  
  Code is adapted from
  https://github.com/tristandeleu/pytorch-maml-rl/blob/493e677e724aa67a531250b0e215c8dbc9a7364a/maml_rl/envs/mujoco/half_cheetah.py
  
  Which was in turn adapted from
  https://github.com/cbfinn/maml_rl/blob/9c8e2ebd741cb0c7b8bf2d040c4caeeb8e06cc95/rllab/envs/mujoco/half_cheetah_env_rand.py
  
  Args:
      task (dict): Subclass specific task information.
code: def __init__(self, task):
      self._task = task
      super().__init__()
      self.spec = EnvSpec(
          action_space=self.action_space,
          observation_space=self.observation_space,
      )
  
file_path: garage/src/garage/envs/mujoco/half_cheetah_env_meta_base.py
imports: from gym.envs.mujoco import HalfCheetahEnv
  import numpy
  from garage import EnvSpec
label_desc: Use image node_id 1 to create a new HalfCheetahEnvMetaBase object from inherited base classes: HalfCheetahEnv_ with example: obj = HalfCheetahEnvMetaBase(task)